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Memory controller: make charging gfp mask aware

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Nick Piggin pointed out that swap cache and page cache addition routines
could be called from non GFP_KERNEL contexts.  This patch makes the
charging routine aware of the gfp context.  Charging might fail if the
cgroup is over it's limit, in which case a suitable error is returned.

This patch was tested on a Powerpc box.  I am still looking at being able
to test the path, through which allocations happen in non GFP_KERNEL
contexts.

[[email protected]: problem with ZONE_MOVABLE]
Signed-off-by: Balbir Singh <[email protected]>
Cc: Pavel Emelianov <[email protected]>
Cc: Paul Menage <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Kirill Korotaev <[email protected]>
Cc: Herbert Poetzl <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Vaidyanathan Srinivasan <[email protected]>
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Balbir Singh 2008-02-07 00:14:02 -08:00 • committed by Linus Torvalds
commit e1a1cd590e
9 changed files with 41 additions and 30 deletions
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14
mm/vmscan.c
View file

@ -1337,16 +1337,11 @@ unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask)
#ifdef CONFIG_CGROUP_MEM_CONT
#ifdef CONFIG_HIGHMEM
#define ZONE_USERPAGES ZONE_HIGHMEM
#else
#define ZONE_USERPAGES ZONE_NORMAL
#endif
unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont)
unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
gfp_t gfp_mask)
{
struct scan_control sc = {
.gfp_mask = GFP_KERNEL,
.gfp_mask = gfp_mask,
.may_writepage = !laptop_mode,
.may_swap = 1,
.swap_cluster_max = SWAP_CLUSTER_MAX,
@ -1357,9 +1352,10 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont)
};
int node;
struct zone **zones;
int target_zone = gfp_zone(GFP_HIGHUSER_MOVABLE);
for_each_online_node(node) {
zones = NODE_DATA(node)->node_zonelists[ZONE_USERPAGES].zones;
zones = NODE_DATA(node)->node_zonelists[target_zone].zones;
if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
return 1;
}